I've got an ASP.net page that runs a script which takes anywhere between 1 second and 10 minutes to run dependant on the parameters passed in to it. My question is, if the server is multicore, will this script automatically make use of all the processors, or is it constricted to one.
View 3 RepliesMy application is a asp.net 3.5 running on iis 6 (windows 2003)
This application is serving 1000's of users daily (100-500 users online).
I want to send an email newsletter to customers weekly.
Around 200,000 emails every time.
This is the code im using:
ThreadPool.QueueUserWorkItem(new WaitCallback(AsyncProcessMailerQueue), null);
private static void AsyncProcessMailerQueue(object data)[code]....
When testing this locally (on my dev machine) i see the application is working alot slower.
Is there a better way to write this code? Should i use ThreadPool.QueueUserWorkItem or create a new thread using Thread t = new Thread(new ThreadStart(DoWork)); ? Will it be better to create a totally seperate application for the purpose of sending the newsletters. will that help if ill run this application on the same machine?
i've seen other posts here talking about ThreadPool vs Thread but its seem no one is sure which is better.
Page A loads very fast; Page B loads very slowly and does some CPU-intensive things on the web server. I noticed that if someone is loading Page B, then Page A also loads slowly - for ALL users. What is the standard practice for making sure this doesn't happen? If multiple users are loading Page B at the same time then Page A is ridiculously slow. Is there an IIS setting, web.config setting, or hardware configuration I could use to make sure that the fast-loading pages aren't bogged down by other pages that need more time to load?
View 1 RepliesI have a page that has 5 sections. Each section takes about 1 second to render.
Page_Load()
{
RenderSection1(); //1 sec
RenderSection2(); //1 sec
RenderSection3(); //1 sec
RenderSection4(); //1 sec
RenderSection5(); //1 sec
}
I would like to speed up the loading of this page. But at the same time make sure that it don't slow down performance of other parts of web application and also do not crash the IIS.
The are several approaches:
Use AJAX requests. Needs to be MVC style requests to Controller or Web Service. Using UpdatePanel around each section will not work - since if I try to submit refreshes to multiple UpdatePanels at the same time using approach here: [URL], the last request will always win: [URL] Use ASP.NET threads described in answer to right way to create thread in ASP.NET web application. So I would use a separate thread for each call: RenderSection1, RenderSection2, etc... Move the logic that takes up time, usually DB requests, into Application Service class in another DLL or External Web Service. Something like
OrderDTO GetDataForViewOrder(int orderID)
{
}
and use multiple threads in that DLL. This approach seems to provide the best scalability, but also introduces UI details into Application Services layer.
When I serve an ASP.NET page, can I render the various controls on the page in parallel?
I have a few Telerik controls (RadGrids) on the page and when I step through the page being loaded, it seems as though the controls are databound and rendered serially.
Maybe this behavior is because I am hooked in with the debugger.
Is there anyway to load the page and have select controls build on separate threads? Is that even conceptually possible or must it be done sequentially?
I was using some code to try to count the number of processors in .NET 2.0:
internal static int GetNumberOfProcessors()
{
List<string> list = new List<string>();
ManagementClass mgmt = new ManagementClass("Win32_Processor");
foreach (ManagementObject obj in mgmt.GetInstances())
{
string item = obj.Properties["SocketDesignation"].Value.ToString();
if (!list.Contains(item))
{
list.Add(item);
}
}
return list.Count;
}
and it blew up like this:
[ManagementException: Access denied ]
System.Management.ManagementException.ThrowWithExtendedInfo(ManagementStatus errorCode) +377984
System.Management.ManagementScope.InitializeGuts(Object o) +654
System.Management.ManagementScope.Initialize() +162
System.Management.ManagementObject.Initialize(Boolean getObject) +492
System.Management.ManagementClass.GetInstances(EnumerationOptions options) +122
System.Management.ManagementClass.GetInstances() +6
This code runs fine locally on cassini, but blows up on our beta server.
When an ASPX page needs to make a call to a potentially long-running operation (lengthy DB query, call to a remote webservice, etc.), I use RegisterAsyncTask, so the IIS worker thread is returned to the pool, rather than being tied up for the duration of the long-running operation. However ASMX webservices don't have a RegisterAsyncTask function. When an ASMX webservice needs to call a potentially long-running operation, how can I implement the same behavior as RegisterAsyncTask? Note: the ASMX webservice is implemented as a script-service: returning json to a direct jQuery/ajax call. Therefore, I cannot use the "BeginXXX" approach described by MSDN, since that implements the asynchronous behavior within the generated client-stub (which isn't used when calling the webservice directly via ajax). EDIT: Adding source code: implemented the BeginXXX/EndXXX approach listed in John's answer. The synchronous "Parrot" function works fine. But the asynchronous "SlowParrot" function gives an internal server error: "Unknown web method SlowParrot"
WebService1.asmx:
[code]....
I have a web service which is running fine when i call it from a handler page (.ashx).
My web service returns a zip file.
But when i call the same code from my aspx page then i get a corrupted zip file. Code for calling is below and is same in both ashx class and aspx page.
[code]....
i have some test code which i run at every load of a page in my asp.net website
this is the code
Sub TryThreads()
Dim t1 = New Thread(AddressOf TryLock)
t1.Priority = ThreadPriority.Lowest[code]...
the "dotrace" simply add a record to a log table in the db.now the right result would be that i should have the entries in the db in order "entered","exiting","exited"but actually when i look in the db i see first 2 "entered" then 2 "exiting" etc.meaning that the multithreading is working ok, but not the synclock is that correct?the real code will be adding records to the db and might be called from several pages of different sessions, but the same code must not run twice concurrently.
EDIT:in response to Sashas wonderful post i changed my code to a class (it was in a module) and now it looks like this:
Public Class CheckClass
Property LockObject As Object
Get [code]...
if i open multiple pages at once, they still clash some times. but if i'm correct, the issue is now not with the synclock as much as with the httpruntime.cache, because when using a standard property, on one page, the code works 100%. so how can i make sure that 2 threads, even from totally different sessions never run the trylock simultaneously?
I'm working on my project, I want to ask is it possible to create multithreading in the web method at the web server side instead, not the client side.
View 3 RepliesI wrote the following code to return a pdf report. The code is based on a multi-threading sample code. Can you guys provide some feedback about it, I am new to mulit-thread.
public delegate void StreamResultDelegate(Stream streamResults);
public class GenerateReport
{[code].....
Multithreading in dotnet apps?
View 3 RepliesI want to create a thread in a asp.net mvc application. What will happen?
A) Thread will die when request ends and the response is sent.
B) Thread will continue to run and response will be sent when thread terminates.
C) Thread will run without blocking the response and die when it have completed it's task
i want to impliment multithreading into my web application how to do that..
i have already knew the concept of multithreading but want to impliment into application..
i have developped an application this application runs correctly for 400 users but when more user hits the server than the application fails to respond...
how improve the performance of the application..is this problem is related to the database server of the application server.
i want know how i can insert data to database in background process
like when you like or unlike a post in facebook
I'm currently reading a lot about node.js. There is a frequent comparison between servers using a traditional thread per request model (Apache), and servers that use an event loop (Nginx, node, Tornado).
I would like to learn in detail about how a request is processed in ASP.NET - from the point it is received in http.sys all the way up to it being processed in ASP.NET itself. I've found the MSDN documentation on http.sys and IIS a little lacking, but perhaps my google-fu is weak today. So far, the best resource I have found is a post on Thomas Marquardt's Blog.
Could anyone shed more light on the topic, or point me to any other resources?
i have a large excel file which has 1 lakh row , i want to insert these data in my table i am using entity framework for insert but it takes more than 45 minutes to insert which is too much, i want to speed up the uploading process what should i do. can I use multithreading for it if yes then how i can use? if any other way to do this process.
View 1 RepliesI am writing a program to crawl the websites. The crawl function is a recursive one and may consume more time to complete, So I used Multi Threading to perform the crawl for multiple websites. What exactly I need is, after completion crawling one website it call next one (which should be in Queqe) instead multiple websites crawling at a time.I am using C# and ASP.NET.
View 4 RepliesI'm trying to create a page that displays a databound gridview to the user showing them the items being processed. Then the page should immediately begin processing. The problem is that the page never shows the gridview (or any other control) until the process is complete. The process is being sent to a WCF service. I've tried setting the page to async and running the wcf in async mode but the content still fails to display.
View 1 RepliesI am creating a multithreading application and I am using countdownevent to signal my object arround 3 times and using wait , but somehow the session goes null , although I am setting a breakpoint after mycountdownevent.wait() and the breakpoint isnt reached , that means the execution is not done...so can someone tell me what is wrong?? here is my code :
this is the main thread
[Code]....
this is the upload image method :
[Code]....
and this is a property for the countdown event :
public
CountdownEvent
_3adasehCountDownEvent;
I am executing a long-running Oracle stored procedure from .NET. The procedure takes about three hours to run. Ideally, the user should be able to kick off the procedure, close the browser, and come back later to check the results.
The problem is that the connection to the Oracle procedure is lost after exactly an hour. As you would expect, the Oracle procedre runs to completion if it is executed from SQL Plus. Strangely enough, it will also run to completion if I run in debug mode on my local machine (I start two threads, one of which executes the procedure. I set a breakpoint on the second thread).
Here is my connection string:
data source= (DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=TCP)(HOST=serverx)(PORT=1521)))(CONNECT_DATA=(SERVER=DEDICATED)(SERVICE_NAME=TestSID)))
Some relevant sections from web.config:
<sessionState mode="InProc" cookieless="false" timeout="3000" stateNetworkTimeout="72000"/>
<httpRuntime executionTimeout="18000" maxRequestLength="2097151" />
Any thoughts as to why the connection is being lost in exactly an hour, and what I can do to maintain the connection until the procedure finishes?
I'm more into the LAMP stack, but I've been asked to work on a site that is running Windows and IIS 2008. I'm a beginner with IIS, so please be patient with me on this, and please ask me to provide more information if that is needed to determine. I read the answer here (Slow first page load on asp.net site), but it seems like if I go to the site with one browser it takes long to load the first page, then fast on all other pages, then if I open up another browser, it's the same thing, so it's not something that is saved on the server, but per session? Is there a way to have the application running at all times? Right now it is taking 12 to 15 seconds for the first page to load. I have access to the WebControlCenter and FTP.
View 3 RepliesIn my ASP.Net 2008 app I've got a page that uses a Master Page and I want to use jquery/javascript but I can't even get this simple code to work. the page loads and controls display but no alert.
[code]...
i developed a web site and i tried to run on iis 6.0 but i got this error..
XML Parsing Error: not well-formed
Location: http://localhost/iaec333/Default2.aspx
Line Number 1, Column 2:<%@ Page Language="VB" MasterPageFile="~/uk.master" AutoEventWireup="false" CodeFile="Default2.aspx.vb" Inherits="Default2" title="Untitled Page" %>
-^
but i can view web pages in browser using " view in Browser".
I am trying to add aspx pages to my website which already has Asp Pages. I made a virtual directory and pointed to existing website where I have placed new Aspx files along with previous Asp files. Now when I try to execute the file. It runs good in first attempt, however, when I click a couple of times of "click me" button browser keeps on processing and does displays my message again.
Code in Default.aspx.vb
Protected Sub Button1_Click(ByVal sender As Object, ByVal e As EventArgs) Handles Button1.Click
Label1.Text = "Heello how are you?"
Code in Default.aspx
<%@ Page Language="vb" AutoEventWireup="false" CodeBehind="Default.aspx.vb" Inherits="WebApplication1._Default" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" >
<head runat="server">
<title>Untitled Page</title>
</head>
<body>
<form id="form1" runat="server">
<div>
</div>
<asp:Label ID="Label1" runat="server" Text=""></asp:Label> <br /><br />
<asp:Button ID="Button1" runat="server" Text="Click Me" />
</form>
</body>
</html>
I initially ran this code in Visual Studio 2008 and it executed well. Later on i transferred my files along with existing Asp Page? Version configured in IIS for ASp.Net is 2.0.50727 Visual Studio 2008 To clarify further, I would like to know, if I am proceeding in right direction to excute my Aspx pages along with Asp? Secondly, why does my browser keeps on processing if I click the button second or third time ? I am not getting exceptions or errors.. And have no idea of reading logs for the program..